Miroslav Krejci created music for many various ensembles and his compositions are among the most prolific of Czech composers. For example, he composed the following: two Operas: The Summer and The Last Hetman, two Symphonies, string quartets, sonatas for violins, trios for wind instruments, sonatinas for brasswind instruments and piano and five piano cycles. He wrote many vocal compositions, especially for chorus. Krejci also created many arrangements of folk songs for chorus and for solo voice with piano accompaniment.